Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	$ 798,575	$ 746,390
Gross Unrealized Gains, Available for Sale	3,027	4,388
Gross Unrealized Losses, Available for Sale	(10,836)	(9,403)
Fair Value, Available for Sale	790,766	741,375
Gross Amortized Cost, Held for Investment Securities	203,525	207,904
Gross Unrealized Gains, Held for Investment Securities	1,155	1,507
Gross Unrealized Losses, Held for Investment Securities	(1,867)	(623)
Fair Value, Held for Investment Securities	202,813	208,787
U.S. Treasury Securities and obligations of U.S. Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	3,833	3,876
Gross Unrealized Gains, Available for Sale	78	23
Gross Unrealized Losses, Available for Sale	0	0
Fair Value, Available for Sale	3,911	3,899
Mortgage-backed Securities, US Government Sponsored Enterprises [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	192,224	123,981
Gross Unrealized Gains, Available for Sale	847	1,501
Gross Unrealized Losses, Available for Sale	(1,322)	(423)
Fair Value, Available for Sale	191,749	125,059
Gross Amortized Cost, Held for Investment Securities	64,993	67,535
Gross Unrealized Gains, Held for Investment Securities	574	812
Gross Unrealized Losses, Held for Investment Securities	(16)	0
Fair Value, Held for Investment Securities	65,551	68,347
Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	242,620	352,483
Gross Unrealized Gains, Available for Sale	470	1,075
Gross Unrealized Losses, Available for Sale	(4,900)	(6,077)
Fair Value, Available for Sale	238,190	347,481
Gross Amortized Cost, Held for Investment Securities	89,265	114,541
Gross Unrealized Gains, Held for Investment Securities	581	695
Gross Unrealized Losses, Held for Investment Securities	(406)	(280)
Fair Value, Held for Investment Securities	89,440	114,956
Private mortgage backed securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	32,558	29,967
Gross Unrealized Gains, Available for Sale	0	291
Gross Unrealized Losses, Available for Sale	(766)	0
Fair Value, Available for Sale	31,792	30,258
Fair Value, Held for Investment Securities	0
Private collateralized mortgage obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	77,965	85,175
Gross Unrealized Gains, Available for Sale	700	688
Gross Unrealized Losses, Available for Sale	(708)	(728)
Fair Value, Available for Sale	77,957	85,135
Gross Amortized Cost, Held for Investment Securities	7,967
Gross Unrealized Gains, Held for Investment Securities	0
Gross Unrealized Losses, Held for Investment Securities	(85)
Fair Value, Held for Investment Securities	7,882
Collateralized loan obligations [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	124,477	127,397
Gross Unrealized Gains, Available for Sale	0	0
Gross Unrealized Losses, Available for Sale	(1,894)	(2,172)
Fair Value, Available for Sale	122,583	125,225
Gross Amortized Cost, Held for Investment Securities	41,300	25,828
Gross Unrealized Gains, Held for Investment Securities	0	0
Gross Unrealized Losses, Held for Investment Securities	(1,360)	(343)
Fair Value, Held for Investment Securities	39,940	25,485
Obligations of state and political subdivisions [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	39,119	23,511
Gross Unrealized Gains, Available for Sale	882	810
Gross Unrealized Losses, Available for Sale	(110)	(3)
Fair Value, Available for Sale	39,891	$ 24,318
Corporate and other debt securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	44,652
Gross Unrealized Gains, Available for Sale	37
Gross Unrealized Losses, Available for Sale	(416)
Fair Value, Available for Sale	44,273
Fair Value, Held for Investment Securities	0
Private commercial mortgage backed securities [Member]
Amortized cost and fair value of securities available for sale and held for investment
Gross Amortized Cost, Available for Sale	41,127
Gross Unrealized Gains, Available for Sale	13
Gross Unrealized Losses, Available for Sale	(720)
Fair Value, Available for Sale	40,420
Fair Value, Held for Investment Securities	$ 0

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
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-Section 50
-Paragraph 2
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

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